Judas and Whistle-blower

Judas noun – One who betrays a trust or an allegiance.

---

Whistle-blower and judas are semantically related In some cases you can use "Whistle-blower" instead a noun "Judas".

Whistle-blower noun – A person who provides information about another's wrongdoing.

---

Judas and whistle-blower are semantically related in traitor topic. Sometimes you can use "Judas" instead a noun phrase "Whistle-blower", if it concerns topics such as person who is disloyal.